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<!DOCTYPE html> <html> <body><!-- This is a comment node! --> <p>单击按钮获取有关主体元素的子节点的信息。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong>元素内部的空白被认为是文本，文本被认为是节点。 评论也被视为节点。</p> <p id="demo"></p> <script> function myFunction() { var c = document.body.childNodes; var txt = ""; var i; for (i = 0; i < c.length; i++) { txt = txt + c[i].nodeName + "<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>